Readers-Writers Variance Rules List-I (Variation Type) A. First Readers-Writers B. Second Readers-Writers C. Shared Lock D. Exclusive Lock List-II (Scheduling Penalty Policy) No reader is kept waiting unless a writer has already obtained permission Once a writer is ready, it executes as soon as possible, blocking new readers Acquired by readers; multiple threads can read concurrently Acquired by writers; blocks all other readers and writers

A-1, B-2, C-3, D-4 Explanation: A. First Readers-Writers -> 1. No reader is kept waiting unless a writer has already obtained permission First Readers-Writers problem me readers ko priority di jaati hai; jab tak koi writer already permission leke access nahi kar raha ho, tab tak kisi bhi reader ko wait nahi karaya jata. B. Second Readers-Writers -> 2. Once a writer is ready, it executes as soon as possible, blocking new readers Second Readers-Writers problem me writers ko priority di jaati hai; jaise hi koi writer ready hota hai, naye readers ko block kar diya jata hai taaki writer jaldi se execute ho sake. C. Shared Lock -> 3. Acquired by readers; multiple threads can read concurrently Shared Lock ko readers dwara acquire kiya jata hai, jisse multiple threads ek sath (concurrently) data ko read kar sakte hain. D. Exclus

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CUET PG 2026 — operating system os PYQ

CUET PG | operating system os | 2026

Readers-Writers Variance Rules

List-I (Variation Type)

A. First Readers-Writers

B. Second Readers-Writers

C. Shared Lock

D. Exclusive Lock

List-II (Scheduling Penalty Policy)

No reader is kept waiting unless a writer has already obtained permission
Once a writer is ready, it executes as soon as possible, blocking new readers
Acquired by readers; multiple threads can read concurrently
Acquired by writers; blocks all other readers and writers

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